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How to interpret or read this?

  1. Dec 1, 2015 #1

    WIN

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    can anyone help with this type of graph... trying to get the relationship between the y n x axis...maybe the gradient ..but i dont know how to read this graph due to the scaling...guide pls?
     

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  2. jcsd
  3. Dec 1, 2015 #2

    DrClaude

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    Staff: Mentor

    Could you please translate the labels on the axes?

    As for the scaling, it is a log-log plot. On the y axis, the lines between 1 and 10 are 2, 3, 4, etc., the lines between 10 and 100 and 20, 30, etc., and so on.
     
  4. Dec 1, 2015 #3

    WIN

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    its rate of flow at x-axis and pressure loss (head loss)at y axis
     
  5. Dec 1, 2015 #4

    SteamKing

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    You enter this chart with a given value of Q in liters / sec. and then follow a vertical line upward until it intersects one of the DN lines. Then you draw a horizontal line from this intersection to the left axis and read the value of Δh.
     
  6. Dec 1, 2015 #5

    DrClaude

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    I'm not sure what the different DN correspond to, but following a given DN line, you get the pressure as a function of the rate of flow, in a logarithmic scale as I explained previously.
     
  7. Dec 1, 2015 #6

    SteamKing

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    I suspect the DN lines represent different sizes of something: a pipe, a fitting, or some such.
     
  8. Dec 1, 2015 #7

    WIN

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    yup..thx a lot.. i just looked up on the log-log plot in wiki... was lost due to the plotting style..
    DN XX is the size of valve according to German standards like ISO standard...
     
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